Model # 345372

Internet #202023037

GREAT STUFF 16 oz. Fireblock Insulating Foam Sealant

Discontinued GREAT STUFF

16 oz. Fireblock Insulating Foam Sealant

  • Save money and time by using this fire code approved formula
  • Air-sealing and insulating saves up to 20% on home energy costs
  • 16 oz. Fireblock Insulating Foam Sealant

Frequently Bought Together

Product Overview

GREAT STUFF Fireblock Insulating Foam Sealant can save much more than energy costs. By sealing the pipe, cable and duct penetrations, you minimize airflow. During a fire, that means flames, harmful gasses and toxic smoke cannot spread as quickly. And in an emergency, that could make all the difference. The fact that it helps you conserve energy, reduce drafts and save on heating and cooling costs is great too.

  • Impedes spread of fire and smoke through service penetrations
  • Recognized as an alternate fireblocking material for residential construction; tested according to ASTM E84, ASTM E814 (Modified), UL 1715
  • Seals service penetrations between floors and electrical runs through wall studs
  • Airtight, water-resistant and has exceptional adhesion to building materials
  • Tack free in 6 minutes; trims in 30 minutes; cures rigid in 8 hours
  • Bright orange colored foam for easy code identification
  • All-direction dispensing

    GREAT STUFF insulating foam

  • How much do you need? Let our calculator help:
    Insulation calculator button

Info & Guides

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Warranty / Certifications

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Customer Questions & Answers

can Great Stuff Fireblock be used for filling gaps between cabinets and stove vents?

Asked by: Handylad
I would.
Answered by: scameron728
Date published: 2016-11-22

Is this product safe for use around non-metallic cable.

Can this foam be used around nonmetallic romex cable in a residental environment
Asked by: Cowman79
I'm not a chemical engineer nor am I a polymer scientist, but I've done exactly what you are considering and found that the foam cures and becomes inert the same day it is applied. I have no regrets after using it in this manner and will do so again whenever need arises.
Answered by: scameron728
Date published: 2016-11-15

What R-value does Great Stuff Fireblock (Model 345372) provide? Can it be used for insulating existing wall cavities?

Asked by: Anonymous
Yes the R-value is the same as the other cans of expanding foam and probably depends on the thickness you apply. But guess what?? This product has a combustion temperature of 240 degrees. ....way lower than actual wood does. Why use this when actual fiberglass insulation would work. Or just use regular expanding foam. Dont think because this can is labeled "fireblock" that it could actually resist a fire. They just hope you dont read the label.
Answered by: skycamper
Date published: 2016-08-08

Can I use this product to insulate my metal stud walls for an exterior Brick oven pizza?

Asked by: John
Dear John: I definitely hope you have NOT tried to insulate the walls around your brick pizza oven with the product. Although the label on the can says, "Fireblock", this version of Great Stuff is NOT approved as a "fireblock" product and will ignite at just 240 degrees F -- just like all versions of Great Stuff. It is a fire hazard and should not be used near any source of heat or flame. Home Depot sells other insulation products that are fireproof, with good insulation performance. The best option is Roxul rock wool, which you can stuff into the gaps between your brick oven and the metal stud walls. Roxul is much denser than fiberglass, mold kind of like clay and stays where you put it. The R value is 4 per inch, almost as good as flammable foam board. See: Roxul Comfortbatt Model # RXCB351525, Home Depot Internet # 202090820 Store SKU # 974419 Many Home Depot stores also carry Roxul ComfortBoard -- a 'board like' version that is similar to foamboard, but fireproof. See: Roxul Comfortboard Model # RXCB11224, Home Depot Internet # 206789748 Store SKU # 1001748089 I hope this is helpful. Mark
Answered by: BvilleBound
Date published: 2016-08-23
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Customer Reviews

16 oz. Fireblock Insulating Foam Sealant is rated 4.1 out of 5 by 69.
Rated 5 out of 5 by from Really Great Stuff Dow's Great Stuff performed just as it said it would and exceeded my expectations for use, functionality, & drying time. Feel good a/b using the fireblock sealant as well. Great Stuff Dow!
Date published: 2010-09-29
Rated 1 out of 5 by from Never use for fire blocking purposes. how misleading is this? by reading and educating yourself youll see this has an igniting temperature of 240 degrees. regular wood has a higher ignition temperature. Dow Corning is betting on you just thinking it can block all kinds of says "fire block" on the label so it must be true......WRONG!!! the only thing different about this and their expanding foam is orange dye. this is an approved material to use per building codes if not used to block actual fire.
Date published: 2016-04-19
Rated 5 out of 5 by from Wear gloves! Try to use all during one session. The cans are a little expensive, but they are great for filling up the required space to prevent fires from spreading. Do NOT get it on your hands/wrist/clothes.. or you will be sorry. Wear those recommended gloves!!! I can attest that Krud Kutter is best to take out on the hands ;) though you will need a scrubby or something to get the job done totally. (I followed that up with Working Man's Hands and the result was awesome - can't say the same for the clothes) I say to use all during one session because you will lose some if you leave it in the can or in the nozzle for the next session and it is pricey. Overall, though, very good!
Date published: 2015-02-12
Rated 3 out of 5 by from This product should not be used as a fire stop -- to meet building code requirements DOW advertises this product as a "fireblock", and HD specs say that it is "Fire Block Rated". The bright orange color is also supposed to highlight this "fireblock" version of Great Stuff for inspectors. As a result, many homeowners and contractors believe that it can be used as a standard fire stop required by the IRC (International Residential Code) and building codes in every state in the USA. The IRC and state building codes do NOT list ANY foam as an approved fire stop material, however. If your home inspector is sharp, he / she will not approve it -- and you will be forced to remove the foam and replace it with an approved material. I hope Home Depot and DOW clarify the standards this product actually meets, and where it should be used -- on behalf of their customers.
Date published: 2014-02-12
Rated 2 out of 5 by from Works like the other spray foams I'm not exactly sure what the advantage is for buying this over normal spray foam. According to the lable there isnt any difference in fire proof or retardency - they are all flamable. Had I paid more attention, I would have purchased the normal spray foam for a little less money.
Date published: 2014-12-10
Rated 5 out of 5 by from Easy to use with great results Bought a house recently with lots of drafts. Have used Great Stuff in the past, but wanted the one with Fireblock since I have kids and want as safe as possible. Using Ruxol insulation combined with Great Stuff Fireblock for ultimate protection. Goes on easy like typical Great Stuff. No more drafts and feel safer and it is also quieter. Big complaint in the past if that you can only use once. However, I found the straws online from a company called "XtendaFoam Nozzles". At about $1.50 for 2 pack of straws it really saves you money. Just wish Home Depot carried the straws as it would be a very popular item. Hint Hint.
Date published: 2013-08-27
Rated 1 out of 5 by from Great stuff This item does not pay you it is a one time use only item they should be on the product somewhere but is it so small you can't read it it should be in leathers large letters
Date published: 2016-07-12
Rated 3 out of 5 by from Inexpensive This product is very underrated and inexpensive better to buy then the 3m its cheaper and does the same thing
Date published: 2016-07-05
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